Mounting for conductors in electrical machinery and method of applying same



Sept. 29, 1925. L55 065 U. L. LINDQLHST MOUNTING F OR GO NDUCTORS IN ELECTRICAL MACHINERY AND METHOD OF APPLYING SAME Filed Nov. 5, 1925 ll"IllIIllllllllKlllllllllllllillllllllllllllllllllli llllllllllllllllll lllllllllllllllllllllflllllll Patented 29, 1925,

UNlTEll) STATES PATENT DAVID L. LINDQUIST, OF HARTSDALE, NEW YORK, ASSIGNOR T OTIS ELEVATOR COM- PANY, OF JERSEY CITY, NEW' E1.

iSEY, A CORPGRA'EEON 0F LTE'W JERSEY.

MOUNTING FOB CONDUflTOR/S IN ELECTRICAL MACHINERY AND lttETI-IOD OF APPLYING SAME.

Application filed November 5, 1923. Serial No. 672,877.

To all whom it may concern.

Be it known that T, DAVID L. lnnnoursr,

a subject of the King of Sweden, residing in Hartsdale, in the county of lVestchester 5 and State of New York, have invented a new and useful Improvement in ltlountings for Conductors in Electrical Machinery and liiiethods of Applying Same, of which the following is a specification.

My invention relates to a mounting for conductors in the slots of electrical machin cry and the method of mounting the conductors.

The invention has for its objects the provision of a construction that will at all times firmly hold the conductors in their proper location in the slots, that will tie together the teeth of the laminated cores, thereby preventing vibration and consequent noise, that will be economical and easy of application without danger of damaging the insulation, and that will continue to perform its function under any or all of the conditions met 9 in operation.

is The principle involved in the invention comprises the use of a resilient means which will at all times exert pressure for holding the conductor firmly in place, and in a preferred form of the invention this pressure is produced in an elastic deformable memger of sheet material such for example as a corrugated sheet metal strip. 1* or producing the pressure or force within the elas tic member, I employ an insert which deforms the elastic member in the actof introducing the insert. Other features will clearly appear from the further description.

As in illustration of how my invention 7 may be carried out, it is described in connection with the accompanying drawings, in which Figure 1 is a horizontal cross-sectional view taken through a conductor bar and slot of the rotor of an A. C. motor.

Figure 2 is a cross-sectional View taken on line 22 of Figure 1.

Figures 3 and 4: are views similar to Figures 1 and 2 showing another embodiment of my invention.

Figures 5 and 6 are similar views showing my invention applied to a semi-closed slot containing an insulated conductor.

Figures 7 and 8 are similar views showing my invention applied to an open type slot containing a form ound insulated coil.

Similar numerals refer to similar parts throughout the several views.

Referring to Figures 1 and 2, the semiclosed slot 10 contains the uninsulated conductor bar 11 held in place by corrugated strip 12 and insert bar 13. In assembling, the conductor bar 11 may be first placed in the slot and the corrugated strip 12 then inserted between conductor bar 11 and the bottom of the slot. Insert 13, which is somewhat thicker than the space between bar 11 and strip 12, and preferably has its ends beveled, is driven in from one end. The ends of strip 12 and insert 13 are then bent down over the ends of the core 15. The corrugated strip 12 is made of elastic material such as sheet steel and has wave like corrugations 14 extending transversely, throughout the length of the slot. The insert 13 may be made for example of mild steel. One end of the insert may be bent before placing it in the slot and the other end after the insert is in place. When the insert 13 is driven in between the corrugated strip 12 and the bar 11, the corrugations are somewhat flattened and due to the resilience of the corrugated strip, each corrugation when thus deformed exerts a pressure against the insert 13 and bar 11 tending to force them upward so that the upper edges of bar 11 contact with the tapered portions 16 of the slot 10. This pressure holds the bar 11 firmly in place throughout the length Of the slot, and it is apparent that this pressure is distributed throughout the length of the slot and applied at a multiplicity of points. To prevent longitudinal movement oi the bar 11, a projection 17 may be termed on the bar 11 after assembly, as by pressing, or a chisel cut 18 may be employed tor the same purpose.

By the construction described the bar is held rigidly both transversely and longitudinally in the slot. In addition, the pressure of the bar 11 against the tapered parts 16 of the slot 10 tends to bind the laminations of the core together near the tips of the core teeth 29, thereby eliminating vibration of the laminatiens this point. Any variaof slot 10.

tion in the size of the various elements in the slots and any expansion or contraction of the different elements will. not att'ect the rigidity oi the bar in the slot, as the olasticity oi the corrugated strip will maintain the bar firm irrespective of such variations. In certain cases insert 13 and strip 12 may be oi magnetic material and in other cases o'if' non-magnetic material depending on. the requirements of design.

in Figures 3 and t another form of strip is shown. This strip 19 is V-shaped and is placed in the slot between the bar 11 and the insert 13, the driving in of the insert resulting in sufiicient deformation oi the strip 19 to place a pressure on the bar 11 against the strip and the tapered parts 16 In this case the ends of the insert 13 are bent over the ends 01 the core 15 and projections from the ends of the strip 19 are bent over the ends of the insert 13. After the bar 11 is in place, the same method as outlined in connection with Figure 1 is used to hold the bar rigid longitudinally except in this case the projections on the bar will bear against the strip 19 instead of against the insert 13. By use of the elements just described, the same firmness of the bar and. laminations is obtained as in Figure 1.

Figures 5 and 6 show a rotor bar 11 covcred with insulation 20 and held in the slot by corrugated strip 21 and insert 22. In this case, the strip 21 has transversely extending); corrugations throughout the length of the slot and has its ends bent over the ends of the core to maintain it and the insert 22 in place. one end being bent after the insert is in place. The corrugations are flattened on one side to prevent injury to the insulation on the bar. By driving the insert 22 into the slot the pressure resulting; trom the deformation of the corrugated strip results in the bar and the laminations being firmly held.

Figures 7 and 8 show a torn] wound insulated conductor coil 23 in an open type slot. 24. The coil consists of wires .25 surrounded by insulation 26. The corrugated strip 21 is similar to that described in connection with Figure 5. Insert 27 is placed in the top of the slot in V-shaped grooves 28. and may be of insulating or any other suitable material. By driving in this insert after the coil and corrugated strip are in the slot, the deformation of the corrugated strip resulting therefrom will firmly hold the bar and. the laminations.

By the use of the resilient mounting tor conductors in slots, as described above, many practical advantages are attained. Variations in the size of individul slots. conductors, and inserts are taken care of without using special precaution in the assembly. Changes due to expansion and contraction are accommodated, while maintaining at all times the different parts tight in the slot. il here insulating material is used, it is apt to become deformed in time, but the parts will remain firmly held by the spring action of l1ll\ strip. Furlhorinore, due to the dis-- tributed pressure between the teeth oi the laminations and the members in the slots vibration ol the teeth is largely prevented which results in (quiet operation.

ll hat I claim is:

1 conductor niountii'ni' tor electrical mach. v: comprisin in ombination. a slotted ody. a cnirluctor lon ritnijlinally disposed in slot within s-iil body and suit ably confined against transverse motion in one direction, and resilient means in! at all time holding; said onducto in its confined position by oxertin'r in said direction a transverse pressure :flainst said conductor at a plurali' ot points along its length.

2" l conductor mounting for electrical mach nes comprising; in combination, a slotted body. a conductor lonp ii'iudinally disposed in a slot within said body and suitably confined against transverse motion in one direction. and a resilient pressure member of: elastic sheet material tor at all times holding said conductor in its confined position by exerting in said direction a trans verse pressure against said conductor at a plurality of points along: its length.

A} conductor mounting); for electrical machines comprising; in combination. a slotted body. a conductor longitudinally disposed in a slot within said body and suitably confined against transverse motion in one directiom and a corrun'ated strip o't elastic material for at all times exerting in said direction a transverse pressure against said conductor at a plurality of points alone its length.

4. A conductor mounting for electrical machines ("()1'lH )l'iSlIlQ in combination. a slotted body" a conductor loim iiudinallv disposed in a slot within said body and suitably confined agrainst transverse motion in one direction and a strip o't elastic material having; wave like corruqations extending: across the slot 'l or at all times exertiim' in said direction a transverse nressure against said conductor at a plurality of points along its length.

An electrical machine comprising; a slotted body. having; confined in a slot thereot a conductor. a resi ient member and an insert tor holding the resilient member elastically deformed.

6. An electrical machine comprisin r a. slotted bodxn having confined in a slot thereof a. conductor. a corrugated li'lOTfiliO! ol elastic sheet material. and an insert 'lor holdin j the ,:orru ;at wl mcmbcr elastically do Formed.

7. An electrical machine comprising a slotted body, having confined in a slot thereof a conductor, a member of elastic sheet material with corrugations extending across the slot, and an insert for holding the said corrugations elastically deformed.

8. An electrical machine comprising a slotted member having confined within a slot thereofthree superposed elements, said elements comprising a conductor, a corrugated member of elastic sheet material, and an insert for holding the corrugated member elastically deformed, at least one of the recited elements having means for holding it against longitudinal movement in the slot.

9. An electrical machine comprising a slotted member having confined within a slot thereof three superposed elements, said elements comprising a conductor, a corrugated member of elastic sheet material, and an insert for holding the corrugated memler elastically deformed, said superposed elements having means for holding all of them against longitudinal movement in the slot.

10. An electrical machine comprising in combination, toothed laminations assembled to fOIL'l a body with slots between the teeth, conductors mounted in the slots oi? said body, and resilient means for holding said conductors in place and maintaining a pres sure against the teeth of said lan'iinations.

The method of mounting a conductor in a slot o'l an electrical machine, comprising introducing into said slot the conductor and deformable elastic member, and then introducing an insert to produce an elastic force in said deformable member whereby said conductor is firmly held in said slot.

12. The method of mounting a conductor in a slot of an electrical machine, comprisin introducing into said slot the conductor and a deforn able elastic member, then introducing an insert member to produce an elastic force in said deformable member, at least one or" said members being left with an end projeciing from said slot, and then bending over the said projecting end to hold the member in the slot.

In testimony whereof, I have signed my name to this specification.

DAVID L. LINDQUIST. 

